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London-based Everledger has placed more than 1.6 million diamonds on a blockchain that includes dozens of attributes for each stone, including colour, carats, and certificate number (which can be inscribed by laser on the crown or girdle of the stone). The method has enabled diamond suppliers and intermediaries to replace a paper certification process with a blockchain ledger, using computer scanning tools to access a ‘digital vault’ which contains the provenance of any diamond.